00001 /*This file is prepared for Doxygen automatic documentation generation.*/ 00015 /* Copyright (c) 2009 Atmel Corporation. All rights reserved. 00016 * 00017 * Redistribution and use in source and binary forms, with or without 00018 * modification, are permitted provided that the following conditions are met: 00019 * 00020 * 1. Redistributions of source code must retain the above copyright notice, this 00021 * list of conditions and the following disclaimer. 00022 * 00023 * 2. Redistributions in binary form must reproduce the above copyright notice, 00024 * this list of conditions and the following disclaimer in the documentation 00025 * and/or other materials provided with the distribution. 00026 * 00027 * 3. The name of Atmel may not be used to endorse or promote products derived 00028 * from this software without specific prior written permission. 00029 * 00030 * 4. This software may only be redistributed and used in connection with an Atmel 00031 * AVR product. 00032 * 00033 * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED 00034 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 00035 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE 00036 * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR 00037 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 00038 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 00039 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 00040 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 00041 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 00042 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE 00043 * 00044 */ 00045 00046 #include "dsp.h" 00047 #include "dsp_echo_cancellation.h" 00048 00049 A_ALIGNED static dsp32_t dsp32_x[DSP_ECHO_CANCELLATION_BUFFER_SIZE]; 00050 A_ALIGNED static dsp32_t dsp32_w[DSP_ECHO_CANCELLATION_BUFFER_SIZE]; 00051 00052 void dsp32_echo_cancellation_init() 00053 { 00054 int i; 00055 00056 for(i=0; i<DSP_ECHO_CANCELLATION_BUFFER_SIZE; i++) 00057 { 00058 dsp32_w[i] = 0; 00059 dsp32_x[i] = 0; 00060 } 00061 } 00062 00063 void dsp32_echo_cancellation_compute(dsp32_t *out, dsp32_t in_mic, dsp32_t in_speaker) 00064 { 00065 dsp32_t y; 00066 00067 dsp32_filt_nlms(dsp32_x, dsp32_w, DSP_ECHO_CANCELLATION_BUFFER_SIZE, in_speaker, in_mic, &y, out); 00068 }